JPS6346342B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mount for changing the vertical and horizontal orientation of a parabolic reflector device of a solar thermal module that concentrates solar energy onto a boiler placed at the focal point of the reflector device.

Solar thermal modules are known that have a parabolic mirror reflector for concentrating solar energy onto a boiler arranged at the focal point of a reflector.
This reflective mirror device, called a concentrator, can be oriented as a unit to follow the movement of the sun during the day.

The reflector device is formed by a parabolic dome made up of a plurality of triangular reflectors or mirrors mounted on a frame. The light beam is focused onto a focal point on a boiler that is integral with this movable reflector arrangement.

The boiler is of the single-tube type, made of copper tubes covered with a coating with a high heat absorption coefficient. This boiler heats the heat exchange fluid that is removed from the concentrator.
The reflector device is mounted on a meridian pedestal, preferably an equatorial ceremonial pedestal. The reflector device is rotatably mounted on a swivel table around a horizontal axis so that its direction can be changed in the vertical direction. The swivel table is mounted on a base fixed to the ground and can be rotated around a vertical axis to face east or west. The vertical direction is determined by a hydraulic jack. The piston rod of this jack is pivotally mounted on the back of the reflector device, and the cylinder is pivotally mounted on the rotating swivel base. The left and right direction is determined by the cable and jack. A module of this type is described, for example, in French Patent No. 2,403,525.
This reflecting mirror device has the advantage that since the boiler follows the movement of the reflecting mirror, there is little loss of reflected light and there is no need for accurate focusing. This turning platform must orient the parabolic reflector device to a "windproof" position where the axis of the reflector device is vertical during stormy winds. The known reflector device turntables for this type have several disadvantages, in particular:
It requires a large amount of power that cannot be ignored.

SUMMARY OF THE INVENTION An object of the present invention is to provide a turning table for vertical and horizontal positioning of the above-mentioned modular reflector device, which consumes very little power. In the event of a failure or breakage of the hydraulic circuit, the turntable automatically positions the reflector device in a "windproof" position, ie, a position in which the axis of the reflector device is vertical. The present invention is particularly directed to a hydraulic jack for use in the above-mentioned turning table. This turning table has extremely high operating safety. The pedestal frame of the present invention is applied to a solar thermal module having a parabolic reflector device which is rotated around a horizontal axis by a jack-type drive assembly, and the cylinder of the jack is attached to the swivel base. The piston rods are each pivotally connected to a reflector device. A basic feature of the present invention is that the jack is provided with return and locking means capable of locking the piston rod at the end of its extrusion stroke, such that the axis of rotation of the reflector device is perpendicular.

According to one feature of the invention, the cylinder has a fixed partition between a piston integral with the piston rod and a movable piston, the former piston containing a chamber on the side of the piston rod to which oil is supplied. The movable piston of the latter slides between the partition plate and the bottom plate, and separates the chamber containing oil on the partition plate side and the chamber containing gas on the bottom plate side. These two chambers provided on both sides of the partition plate are connected to each other under the control of a control valve.

The invention will now be explained in more detail with reference to illustrative embodiments shown in the accompanying drawings, in which: FIG.

The solar thermal module shown in FIG. 1 has a reflecting mirror device, that is, a condensing device 1, which is composed of a parabolic reflecting dome 11 and a frame 12 that supports the reflecting dome on its concave side. A reflective dome is made of triangular mirrors whose edges abut against each other so that the reflected light from each mirror is focused at the focal point of the parabola. The reflecting mirror is attached to a parabolic reflecting dome 11 by a radial connecting rod 2.
It is integrated with the boiler 3 installed at the focal point of the The boiler is made of single-tube copper tubes covered with a coating with a high heat absorption coefficient. At least one of the connecting rods is provided with a passageway through which a heat exchange fluid circulates through the boiler tubes.

The reflecting mirror device 1 is supported by a base 4 fixed to the ground. The reflector device is designed to be able to rotate up and down at a horizontal joint shaft 13 that connects the frame 12 to the swivel table 5. The swivel table 5 can rotate around a vertical axis 51 with respect to the base 4.

The swivel base 5 supports a worm type reducer,
The screw of this speed reducer is coaxial with the axis 51 and is screwed into a gear 52 fixed to the base 4.
The reducer is driven by a hydraulic motor.

The parabolic reflector device 1 is turned up and down about the articulation axis 13 by means of a jack 6. The piston rod 61 of this jack is connected to the frame 1 of the reflector device via a joint member, that is, a ball joint 62.
It is connected to 2. Jatsuki cylinder 63
is connected to the swivel base 5 via a cylindrical joint 64.

The joint member 62 is offset from the rotation axis 14 of the parabolic dome, and is offset from the rotation axis 51 of the swivel base.
is shifted to one side. The joint member 13 is located between the joint member 62 and the axis of rotation 14 .

The vertical movement jack 6 is aligned with the rotation axis 1.
4 is almost vertical and the axis of the reflector device is "wind resistant"
A returning and locking means is constituted for rotating the reflecting mirror device 1 to a tilted position and locking the reflecting mirror device in this position.

The vertical turning jack shown in detail in FIG. 2 has a cylinder 63, within which is provided a separating partition plate 66 fixedly attached between the cover plate and the bottom plate through which the piston rod 61 passes. ing. This partition plate 66 is the piston rod 6 for operation.
It is arranged between a movable piston 65 integral with 1 and another movable piston 69. The piston 65 slides between a partition plate 66 and a cover plate through which the piston rod passes. Another piston 69 slides between the partition plate 66 and the cylinder bottom plate. The piston 65 separates a chamber 671 to which oil on the piston rod side, that is, hydraulic fluid, is supplied from a chamber 672 defined by a partition plate 66 and containing oil. The movable piston 69 is defined by a chamber 681 containing oil on the partition plate side and a chamber 68 containing pressurized gas such as nitrogen, which is defined by the bottom plate.
There is a separation between the two. The two intermediate chambers 672 and 681 provided on both sides of the partition plate 66 contain oil or hydraulic fluid and are connected to the control check valve 662.
The control check valve 662 controls the flow of oil between the two chambers. The chamber 671 through which the piston rod passes has an adjusted orifice 66.
Oil is supplied from a flow path 664 via 3. The check valve 662 is connected to the orifice 6 of the flow path 664.
It is controlled by a flow path 665 branched from downstream of 63. The pump 71 is connected to the chamber 67 via the flow path 664.
1 and the control check valve 662 with oil or hydraulic fluid. The amount of oil discharged is controlled by solenoid valves 73 and 74.

The operation of the above-mentioned vertical turning mechanism will be explained below.

When the piston rod is placed at any intermediate position in the vertical direction, the chamber 671 through which the piston rod passes is pressurized. The force caused by the pressure of nitrogen in chamber 682 is greater than the force due to the weight of the reflector system and is therefore overbalanced. When the downstream side of orifice 663 is pressurized, the check valve is opened by pilot pressure. The two intermediate chambers 681 and 672 are the flow path 66
1 to form a single hydraulic chamber,
The two pistons 69 and 65 move synchronously as if they were simply integrated.

When oil from the pump is introduced into chamber 671, the piston rod is retracted and piston 69 compresses the nitrogen. Open valve 73 or valve 74 to open chamber 6.
When the oil in 71 is released, the nitrogen contained in chamber 682 causes piston 69 and piston 6 to
5 is pressed and the piston rod is pushed out. At the end of the piston stroke (when the piston rod is pushed out to its maximum extent), there is no fluid passing through the orifice 663, so the oil pressure becomes zero downstream of the orifice 663, particularly in the chamber 671. Therefore, the pilot pressure in the check valve 662 disappears and the chamber 67 defined by the piston 65 integral with the piston rod is removed.
2 and the chamber 681 defined by the piston 69 without piston rod is blocked. At the stroke end position when the piston rod is pushed out, the reflector device is in a windproof position (the axis of rotation is in a substantially vertical position), and the position of the piston rod is locked by the jack. Even if a strong wind acts on the reflector device, the piston rod will not retract and therefore the reflector device will not rotate. It is clear that modifications, improvements in detail and the use of equivalent means are possible without departing from the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a solar thermal module equipped with a turning table according to the present invention. Figure 2 is a conceptual diagram of the hydraulic system for vertical turning. DESCRIPTION OF SYMBOLS 1...Reflector device, 2...Connection rod, 3...Boiler, 4...Base, 5...Swivel base, 6...Jacket, 11...Reflector dome, 12...Frame, 1
3... Joint axis, 14... Rotation axis, 61... Piston rod, 62... Joint member, 63... Cylinder, 65... Piston, 66... Partition plate, 69
...Piston, 71...Pump, 73,74...
solenoid valve.

Claims (1)

Claims: 1. Changing the orientation of the circumference of the horizontal axis 13 by means of a drive assembly comprising a jack 6 in which the cylinder 63 is articulated with the swivel 5 and the piston rod 61 with the reflector device 1. This is a turntable for a solar thermal module having a parabolic reflector device 1 which is adapted to be able to push out the piston rod 61 and place the reflector device in a position such that the axis of rotation 14 of the reflector device 1 is approximately vertical. A turning table for a solar thermal module, characterized in that the jack 6 is provided with a return and locking means for locking the piston rod at the end position of the piston rod extrusion stroke corresponding to when the piston rod reaches the end position of the piston rod extrusion stroke. 2. The jack 6 has one fixed partition plate 66, and this partition plate is provided between the piston 65, which is integrated with the piston rod 61, and the movable piston 69, which slides between the partition plate 66 and the bottom plate. , the piston 65 has a chamber 671 on the piston rod side where oil is supplied and a chamber 672 on the partition plate side where oil is accommodated.
The movable piston 69 separates a chamber 681 containing oil on the partition plate side and a chamber 682 containing gas on the bottom plate side. The turning table according to claim 1, wherein the chambers 672 and 681 are connected to each other under the control of a control valve 662. 3. The turning table according to claim 2, characterized in that oil is supplied to said chamber 671 through which the piston rod 61 passes through an adjusted orifice 663. 4 Horizontal joint axis 1 of the reflector device 1 on the swivel base 5
The turning table according to claim 1 or 2, wherein the turning table 3 is offset from the rotation axis 51 of the turning table 5 and the rotation axis 14 of the reflecting mirror device, respectively.